Historical clue formulations

• ___-El (Superman) — 2026-05-22
• ___-El (Superman's birth name) — 2025-09-10
• ___-El (Superman's birth name) — 2025-08-31
• Carrier to 46-Across, for short — 2024-11-02
• ___ Penn, actor who held a post in the Obama White House — 2023-07-23
• Carrier to Seoul, in brief — 2023-06-05
• Actor/comedian Penn — 2023-03-07
• ___ Kan (dog food brand) — 2022-10-17
• Comic Penn — 2022-04-10
• ___ Kan (dog food brand) — 2021-09-27
• ___-El (Superman's birth name) — 2020-08-09
• ___-El (Superman's birth name) — 2020-06-24
• Actor Penn — 2019-07-25
• Carrier to Seoul, for short — 2017-08-20
• Penn of "Harold & Kumar" films — 2017-05-23
• Carrier to Seoul, for short — 2016-11-07
• Actor Penn — 2016-08-21
• Carrier to Seoul, for short — 2015-06-18
• Actor Penn of "Van Wilder" — 2013-12-07
• Early "Doctor Who" villain — 2013-12-06
• Actor Penn of "Van Wilder" — 2011-02-13
• Penn of "Harold & Kumar" films — 2010-12-14
• ___ Kan pet food — 2007-06-24
• Asian carrier, in brief — 2005-06-12
• ___ Kan (pet food) — 2005-03-07
• ___-El (Superman's birth name) — 2004-07-02
• Asian carrier — 2004-03-20
• Asian carrier — 2003-10-10
• ___ Kan — 2001-08-30
• ___ Kan dog food — 1999-09-09
• ___ Kan (pet food brand) — 1998-09-29
• Far East carrier, for short — 1998-07-05
• ___ Kan — 1997-10-03
• ___-El (Superman's real name) — 1996-12-29
• _____ Kan pet foods — 1995-10-22